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Infants have smaller lungs, and although they also have smaller bodies, the smaller lungs must work faster to exchange the amount of gasses, i.e. O2 and CO2, the same way their hearts beat faster than an adult's to pump the amount of blood they need because of it's small size.

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Q: Why is the adult respiratory rate lower than an infant's respiratory rate?
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Related questions

Is the respiratory rate lowest in newborn infants?

No, it's highest.


What is considered an infants respiratory rate is 45 beats per minute?

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